After standard ED treatment for headache, participants in the study will be asked to answer questions about prior headaches and medical history, and some census-like questions about race/ethnicity, salary, and education via a 20-minute interview with a research associate. The researchers will follow-up with 10-minute telephone calls to each participant's home in 24 hours and in 3 months with additional questions. Total length of time for study participation is approximately 40 minutes.